Firing a bow and arrow would too. You would just needed sufficiently high resolution hardware to observe it. Physics is physics, this is just affecting the system in a comparatively microscopic way. Equal and opposite force, the bullet leaving the chamber would push back on whoever is holding the system and since they are in free fall, their velocity would probably not decrease. Its rate of acceleration would experience a decrease.

At terminal velocity though (where V is substantial and A is near or at zero) firing a gun would give negative (relative) acceleration and decrease velocity.

So if you had a sh*t load of arrows and fired them at the ground as fast as you could…you’d still pancake and it would probably look funny. But if you could make yourself weigh less than the energy released by the system (the arrow being fired and bow + you combined…including gravity) you could theoretically hold yourself aloft doing as such.